diff --git a/src/desfire/apduinstructions.rs b/src/desfire/apduinstructions.rs
new file mode 100644
index 0000000..3ed2b2d
--- /dev/null
+++ b/src/desfire/apduinstructions.rs
@@ -0,0 +1,41 @@
+#[repr(u8)]
+pub enum APDUInstructions {
+    AUTHENTICATE_ISO            = 0x1A,
+    AUTHENTICATE_AES            = 0xAA,
+    CHANGE_KEY_SETTINGS         = 0x54,
+    SET_CONFIGURATION           = 0x5C,
+    CHANGE_KEY                  = 0xC4,
+    GET_KEY_VERSION             = 0x64,
+    CREATE_APPLICATION          = 0xCA,
+    DELETE_APPLICATION          = 0xDA,
+    GET_APPLICATION_IDS         = 0x6A,
+    FREE_MEMORY                 = 0x6E,
+    GET_DF_NAMES                = 0x6D,
+    GET_KEY_SETTINGS            = 0x45,
+    SELECT_APPLICATION          = 0x5A,
+    FORMAT_PICC                 = 0xFC,
+    GET_VERSION                 = 0x60,
+    GET_CARD_UID                = 0x51,
+    GET_FILE_IDS                = 0x6F,
+    GET_FILE_SETTINGS           = 0xF5,
+    CHANGE_FILE_SETTINGS        = 0x5F,
+    CREATE_STDDATAFILE          = 0xCD,
+    CREATE_BACKUPDATAFILE       = 0xCB,
+    CREATE_VALUE_FILE           = 0xCC,
+    CREATE_LINEAR_RECORD_FILE   = 0xC1,
+    CREATE_CYCLIC_RECORD_FILE   = 0xC0,
+    DELETE_FILE                 = 0xDF,
+    GET_ISO_FILE_IDS            = 0x61,
+    READ_DATA                   = 0xBD,
+    WRITE_DATA                  = 0x3D,
+    GET_VALUE                   = 0x6C,
+    CREDIT                      = 0x0C,
+    DEBIT                       = 0xDC,
+    LIMITED_CREDIT              = 0x1C,
+    WRITE_RECORD                = 0x3B,
+    READ_RECORDS                = 0xBB,
+    CLEAR_RECORD_FILE           = 0xEB,
+    COMMIT_TRANSACTION          = 0xC7,
+    ABORT_TRANSACTION           = 0xA7,
+    CONTINUE                    = 0xAF,
+}
diff --git a/src/desfire/apdustatuscodes.rs b/src/desfire/apdustatuscodes.rs
new file mode 100644
index 0000000..bd0eb8f
--- /dev/null
+++ b/src/desfire/apdustatuscodes.rs
@@ -0,0 +1,68 @@
+#[repr(u16)]
+pub enum APDUStatusCodes {
+    /// Successful operation
+    OPERATION_OK = 0x9000,
+
+    /// No changes done to backup files, CommitTransaction / AbortTransaction not necessary
+    NO_CHANGES = 0x900C,
+
+    /// Insufficient NV-Memory to complete command
+    OUT_OF_EEPROM_ERROR = 0x900E,
+
+    /// Command code not supported
+    ILLEGAL_COMMAND_CODE = 0x901C,
+
+    /// CRC or MAC does not match data Padding bytes not valid
+    INTEGRITY_ERROR = 0x901E,
+
+    /// Invalid key number specified
+    NO_SUCH_KEY = 0x9040,
+
+    /// Invalid key number specified
+    LENGTH_ERROR = 0x907E,
+
+    /// Current configuration / status does not allow the requested command
+    PERMISSION_DENIED = 0x909D,
+
+    /// Value of the parameter(s) invalid
+    PARAMETER_ERROR = 0x909E,
+
+    /// Requested AID not present on PICC
+    APPLICATION_NOT_FOUND = 0x90A0,
+
+    /// Unrecoverable error within application, application will be disabled
+    APPL_INTEGRITY_ERROR = 0x90A1,
+
+    /// Current authentication status does not allow the requested command
+    AUTHENTICATION_ERROR = 0x90AE,
+
+    /// Additional data frame is expected to be sent
+    ADDITIONAL_FRAME = 0x90AF,
+
+    /// Attempt to read/write data from/to beyond the file\'s/record\'s limits. Attempt to exceed the limits of a value file.
+    BOUNDARY_ERROR = 0x90BE,
+
+    /// Unrecoverable error within PICC, PICC will be disabled
+    PICC_INTEGRITY_ERROR = 0x90C1,
+
+    /// Previous Command was not fully completed Not all Frames were requested or provided by the PCD
+    COMMAND_ABORTED = 0x90CA,
+
+    /// PICC was disabled by an unrecoverable error
+    PICC_DISABLED_ERROR = 0x90CD,
+
+    /// Number of Applications limited to 28, no additional CreateApplication possible
+    COUNT_ERROR = 0x90CE,
+
+    /// Creation of file/application failed because file/application with same number already exists
+    DUPLICATE_ERROR = 0x90DE,
+
+    /// Could not complete NV-write operation due to loss of power, internal backup/rollback mechanism activated
+    EEPROM_ERROR = 0x90EE,
+
+    /// Specified file number does not exist
+    FILE_NOT_FOUND = 0x90F0,
+
+    /// Unrecoverable error within file, file will be disabled
+    FILE_INTEGRITY_ERROR = 0x90F1,
+}
diff --git a/src/desfire/desfire.rs b/src/desfire/desfire.rs
new file mode 100644
index 0000000..53a3974
--- /dev/null
+++ b/src/desfire/desfire.rs
@@ -0,0 +1,388 @@
+use crate::{Card, error};
+use crate::iso7816_4::apducommand::{APDUCommand, IsoCase};
+use crate::desfire::apduinstructions::APDUInstructions;
+use crate::crypto::cipher::tdes::Tdes;
+use crate::crypto::cipher::aes::AES;
+use crate::crypto::cipher::Cipher;
+use crate::crypto::util;
+use crate::error::{Result, Error};
+use crate::error::Error::{InvalidApplicationID, InvalidKeyID, InvalidFileID};
+use crate::crypto::util::expand_to_blocksize;
+use crate::desfire::FileCommunication;
+use crate::iso7816_4::apduresponse::APDUResponse;
+
+pub struct Desfire {
+    card: Box<dyn Card>,
+    session_key: Vec<u8>,
+    cbc_iv: Vec<u8>,
+}
+
+impl Desfire {
+    // Desfire commands
+
+    /// <summary>
+    /// Select Application by ApplicationID (AID)
+    /// </summary>
+    /// <param name="aid">3 Byte AID</param>
+    pub fn select_application(&self, aid: u32) -> Result<()> {
+        if aid > 0xFFFFFF {
+            return Err(InvalidApplicationID);
+        }
+
+        let cmd_select_app = APDUCommand {
+            case: IsoCase::Case4Short,
+            cla: 0x90,
+            ins: APDUInstructions::SELECT_APPLICATION as u8,
+            data: Option::from(aid.to_le_bytes()[..3].to_vec()), //FIXME: Which byteorder?
+            ..Default::default()
+        };
+
+        let response = self.card.transmit(cmd_select_app).unwrap();
+
+        response.check().map_err(|e| e)
+    }
+
+    /// <summary>
+    /// Authenticate to PICC, with ISO Authenticate for DES Key
+    /// </summary>
+    /// <param name="key_id">0x01 - 0x0D</param>
+    /// <param name="key">Array of 8/16 Bytes</param>
+    /// <param name="rndA">!!! WARNING For Testing only !!!</param>
+    pub fn authenticate_iso_des(&mut self, key_id: u8, key: &[u8], rnd_a: Option<[u8; 8]>) -> Result<()> {
+        if key_id > 0x0E {
+            return Err(InvalidKeyID);
+        }
+
+        let cmd_challenge_request = APDUCommand {
+            case: IsoCase::Case4Short,
+            cla: 0x90,
+            ins: APDUInstructions::AUTHENTICATE_ISO as u8,
+            data: Option::from(vec!(key_id)),
+            ..Default::default()
+        };
+
+        let response = self.card.transmit(cmd_challenge_request).unwrap();
+
+        match response.check() {
+            Ok(_) => {}
+            Err(e) => { return Err(e); }
+        }
+
+        let rnd_b_enc = response.body.as_slice();
+
+        let mut rnd_b = Tdes::decrypt(rnd_b_enc, key, vec![0 as u8; 8].as_slice()).unwrap();
+
+        rnd_b.rotate_left(1);
+
+        let rnd_b_rl = rnd_b.as_slice();
+
+        let rnd_a = match rnd_a {
+            None => { rand::random() }
+            Some(i) => { i }
+        };
+
+        let rnd_ab = [&rnd_a, rnd_b_rl].concat();
+
+        let rnd_ab_enc = Tdes::encrypt(rnd_ab.as_slice(), key, rnd_b_enc).unwrap();
+
+        let cmd_challenge_response = APDUCommand {
+            case: IsoCase::Case4Short,
+            cla: 0x90,
+            ins: APDUInstructions::CONTINUE as u8,
+            data: Some(rnd_ab_enc),
+            ..Default::default()
+        };
+
+        let response = self.card.transmit(cmd_challenge_response).unwrap();
+
+        match response.check() {
+            Ok(_) => {}
+            Err(e) => { return Err(e); }
+        }
+
+        let mut rnd_a_rot_from_card = Tdes::decrypt(response.body.as_slice(), key, rnd_b.as_slice()).unwrap();
+        rnd_a_rot_from_card.rotate_right(1);
+        let rnd_a_from_card = rnd_a_rot_from_card.as_slice();
+
+        if rnd_a != rnd_a_from_card {
+            return Err(Error::InvalidPICCChallenge);
+        }
+
+        self.session_key = generate_session_key_des(&rnd_a, rnd_b.as_slice()).unwrap();
+
+        self.cbc_iv = vec![0 as u8; 8];
+        Ok(())
+    }
+
+    /// <summary>
+    /// Format PICC
+    /// Need Authentication for PICC / Application 0x000000
+    /// </summary>
+    fn format_picc(&self) -> Result<()> {
+        let cmd_format = APDUCommand {
+            case: IsoCase::Case2Short,
+            cla: 0x90,
+            ins: APDUInstructions::FORMAT_PICC as u8,
+            ..Default::default()
+        };
+
+        let response = self.card.transmit(cmd_format).unwrap();
+
+        response.check()
+    }
+
+    /// <summary>
+        /// Create Application for ApplicationID
+        /// </summary>
+        /// <param name="aid">3 Byte ID</param>
+    fn create_application(&self, aid: u32, keysetting1: u8, keysetting2: u8) -> Result<()> {
+        if aid > 0xFFFFFF {
+            return Err(InvalidApplicationID);
+        }
+
+        let mut data = aid.to_le_bytes()[..3].to_vec();
+        data.push(keysetting1);
+        data.push(keysetting2);
+        let cmd_create_application = APDUCommand {
+            case: IsoCase::Case4Short,
+            cla: 0x90,
+            ins: APDUInstructions::CREATE_APPLICATION as u8,
+            data: Option::from(data), //FIXME: Which byteorder?
+            ..Default::default()
+        };
+
+        let response = self.card.transmit(cmd_create_application).unwrap();
+
+        response.check()
+    }
+
+    /// <summary>
+    /// Change AES key, the same as Authenticated
+    /// </summary>
+    /// <param name="key_id">0x01 - 0x0D</param>
+    /// <param name="new_key">Array of 16 Bytes</param>
+    /// <param name="key_version">Version of Key(min. 0x10)</param>
+    fn change_key_aes(&mut self, key_id: u8, new_key: &[u8], key_version: u8) -> Result<()> {
+        if key_id >= 0x0E {
+            return Err(InvalidKeyID);
+        }
+
+        let header = vec![0xC4, key_id];
+        let key_and_version: Vec<u8> = [new_key, &[key_version]].concat();
+        let mut command = vec![];
+
+        command.extend(&header);
+        command.extend(&key_and_version);
+
+        let crc = crate::crypto::crc::crc32::calculate(command.as_slice());
+
+        let mut plaintext: Vec<u8> = vec![];
+        plaintext.extend(key_and_version);
+        plaintext.extend(crc);
+
+        let plaintext_pad = expand_to_blocksize(plaintext.as_mut_slice(), 16)?;
+
+        let cryptogram = AES::encrypt(plaintext_pad, self.session_key.as_slice(), self.cbc_iv.as_slice())?;
+
+        self.cbc_iv = util::extract_last_block(cryptogram.as_slice(), 16)?.to_vec();
+
+        let mut data: Vec<u8> = vec![key_id];
+        data.extend(cryptogram);
+
+        let cmd_change_key = APDUCommand {
+            case: IsoCase::Case4Short,
+            cla: 0x90,
+            ins: APDUInstructions::CHANGE_KEY as u8,
+            data: Option::from(data), //FIXME: Which byteorder?
+            ..Default::default()
+        };
+
+        let response = self.card.transmit(cmd_change_key).unwrap();
+
+        response.check()
+    }
+
+    /// <summary>
+        /// Change AES key, other than Authenticated
+        /// </summary>
+        /// <param name="key_id">0x01 - 0x0D</param>
+        /// <param name="new_key">Array of 16 Bytes</param>
+        /// <param name="old_key">Array of 16 Bytes</param>
+        /// <param name="key_version">Version of Key(min. 0x10)</param>
+    fn change_other_key_aes(&mut self, key_id: u8, new_key: &[u8], old_key: &[u8], key_version: u8) -> Result<()> {
+        if key_id >= 0x0E {
+            return Err(InvalidKeyID);
+        }
+
+        let header = vec![0xC4, key_id];
+
+        let key_xor : Vec<u8> = new_key.iter().zip(old_key.iter()).map(|(&x1, &x2)| x1 ^ x2).collect();
+
+        let key_and_version: Vec<u8> = [key_xor, vec![key_version]].concat();
+        let mut command = vec![];
+
+        command.extend(&header);
+        command.extend(&key_and_version);
+
+        let crc = crate::crypto::crc::crc32::calculate(command.as_slice());
+
+        let mut plaintext: Vec<u8> = vec![];
+        plaintext.extend(key_and_version);
+        plaintext.extend(crc);
+
+        let plaintext_pad = expand_to_blocksize(plaintext.as_mut_slice(), 16)?;
+
+        let cryptogram = AES::encrypt(plaintext_pad, self.session_key.as_slice(), self.cbc_iv.as_slice())?;
+
+        self.cbc_iv = util::extract_last_block(cryptogram.as_slice(), 16)?.to_vec();
+
+        let mut data: Vec<u8> = vec![key_id];
+        data.extend(cryptogram);
+
+        let cmd_change_key = APDUCommand {
+            case: IsoCase::Case4Short,
+            cla: 0x90,
+            ins: APDUInstructions::CHANGE_KEY as u8,
+            data: Option::from(data), //FIXME: Which byteorder?
+            ..Default::default()
+        };
+
+        let response = self.card.transmit(cmd_change_key).unwrap();
+
+        response.check()
+    }
+
+    fn create_file_standard(&self, file_id: u8, communication: FileCommunication, access_rights: u16, size: u32) -> Result<()>{
+        if file_id >= 0x20 {
+            return Err(InvalidFileID)
+        }
+
+        let access_rights = access_rights.to_le_bytes().to_vec();
+        let size = size.to_le_bytes()[..3].to_vec();
+        let mut data = vec![file_id, communication as u8];
+        data.extend(&access_rights);
+        data.extend(&size);
+
+        let cmd_create_file_standard = APDUCommand {
+            case: IsoCase::Case4Short,
+            cla: 0x90,
+            ins: APDUInstructions::CREATE_STDDATAFILE as u8,
+            data: Option::from(data),
+            ..Default::default()
+        };
+
+        let response = self.card.transmit(cmd_create_file_standard).unwrap();
+
+        response.check()
+    }
+
+    /// <summary>
+        /// Write Data to File
+        /// </summary>
+        /// <param name="file_id">ID of File (0x00 - 0x20)</param>
+        /// <param name="offset">Offset for File</param>
+        /// <param name="data">Data to write</param>
+    fn write_data(&self, file_id: u8, offset: u32, data: &[u8]) -> Result<()> {
+        if file_id >= 0x20 {
+            return Err(InvalidFileID)
+        }
+
+        const MAX_BYTES_PER_TRANSACTION: usize = 47;
+        let mut bytes_writen: usize = 0;
+        let length: usize = data.len();
+        
+        let mut ret: Result<()> = Err(error::Error::Simple(simple_error::simple_error!("Error while writing data to card"))); //TODO: Replace with better error
+
+        while bytes_writen != data.len() {
+            let bytes_towrite = match length - bytes_writen < MAX_BYTES_PER_TRANSACTION {
+                true => { length - bytes_writen }
+                false => { MAX_BYTES_PER_TRANSACTION }
+            };
+
+            let mut write_buffer = vec![file_id];
+            write_buffer.append(&mut offset.to_le_bytes()[..3].to_vec());
+            write_buffer.append(&mut bytes_towrite.to_le_bytes()[..3].to_vec());
+            write_buffer.append(&mut data[bytes_writen..bytes_writen + bytes_towrite].to_vec());
+            bytes_writen += bytes_towrite;
+
+            let cmd_write_data = APDUCommand {
+                case: IsoCase::Case4Short,
+                cla: 0x90,
+                ins: APDUInstructions::WRITE_DATA as u8,
+                data: Option::from(write_buffer),
+                ..Default::default()
+            };
+
+            let response = self.card.transmit(cmd_write_data).unwrap();
+
+            ret = response.check();
+        };
+        
+        return ret
+    }
+
+    /// <summary>
+        /// Read Data from File
+        /// </summary>
+        /// <param name="file_id">ID of File (0x00 - 0x20)</param>
+        /// <param name="offset">Offset for File</param>
+        /// <param name="length">Lenght of Data</param>
+    fn read_data(&self, file_id: u8, offset: u32, length: usize) -> Result<Vec<u8>> {
+        if file_id >= 0x20 {
+            return Err(InvalidFileID)
+        }
+
+        const MAX_BYTES_PER_TRANSACTION: usize = 47;
+        let mut bytes_read: usize = 0;
+
+        let mut read_buffer: Vec<u8> = vec![];
+
+        while bytes_read != length {
+            let bytes_toread = match length - bytes_read < MAX_BYTES_PER_TRANSACTION {
+                true => { length - bytes_read }
+                false => { MAX_BYTES_PER_TRANSACTION }
+            };
+
+            let mut send_buffer = vec![file_id];
+            send_buffer.append(&mut offset.to_le_bytes()[..3].to_vec());
+            send_buffer.append(&mut bytes_toread.to_le_bytes()[..3].to_vec());
+            bytes_read += bytes_toread;
+
+            let cmd_read_data = APDUCommand {
+                case: IsoCase::Case4Short,
+                cla: 0x90,
+                ins: APDUInstructions::READ_DATA as u8,
+                data: Option::from(send_buffer),
+                ..Default::default()
+            };
+
+            let response = self.card.transmit(cmd_read_data).unwrap();
+
+            response.check().or_else(|e| return Err(e));
+
+            read_buffer.append(&mut response.body()[..bytes_toread].to_vec());
+        };
+
+        return Ok(read_buffer)
+
+    }
+}
+
+
+
+/// <summary>
+        /// Generates SessionKey for DES Authentification
+        /// </summary>
+        /// <returns>8Byte SessionKey</returns>
+fn generate_session_key_des(rnd_a: &[u8], rnd_b: &[u8]) -> Option<Vec<u8>> {
+    Some([&rnd_a[..4], &rnd_b[5..8]].concat())
+}
+
+/// <summary>
+    /// Generates SessionKey for AES Authentification
+    /// </summary>
+    /// <returns>16Byte SessionKey</returns>
+fn generate_session_key_aes(rnd_a: &[u8], rnd_b: &[u8]) -> Option<Vec<u8>> {
+    //FIXME: Check math
+    Some([&rnd_a[..4], &rnd_b[5..8], &rnd_a[5..8], &rnd_b[..4]].concat())
+}
\ No newline at end of file
diff --git a/src/desfire/mod.rs b/src/desfire/mod.rs
index e69de29..bcaae7f 100644
--- a/src/desfire/mod.rs
+++ b/src/desfire/mod.rs
@@ -0,0 +1,158 @@
+/// <summary>
+/// hold the Access Rights for changing application keys (Change Key command)
+/// </summary>
+#[repr(u8)]
+pub enum ChangeApplicationKey {
+    /// <summary>
+    /// Application master key authentication is necessary to change any key (default)
+    /// </summary>
+    MASTERKEY = 0x00,
+    /// <summary>
+    /// Authentication with the key to be changed (same Key#) is necessary to change a key
+    /// </summary>
+    SAMEKEY = 0x0E,
+    /// <summary>
+    /// All keys (except application master key, see Bit 0) within this application are frozen
+    /// </summary>
+    ALLKEYS = 0x0F,
+}
+
+/// <summary>
+/// codes whether the application master key is changeable
+/// </summary>
+#[repr(u8)]
+pub enum ChangeMasterKey {
+    /// <summary>
+/// Application master key is not changeable anymore (frozen)
+/// </summary>
+    FROZEN = 0x00,
+
+    /// <summary>
+/// Application master key is changeable (authentication with the current application master key necessary, default)
+/// </summary>
+    CHANGEABLE = 0x01,
+}
+
+/// <summary>
+/// codes whether a change of the application master key settings is allowed
+/// </summary>
+#[repr(u8)]
+pub enum ChangeMasterKeySettings {
+
+/// <summary>
+/// configuration not changeable anymore (frozen)
+/// </summary>
+FROZEN = 0x00,
+
+/// <summary>
+/// this configuration is changeable if authenticated with the application master key (default)
+/// </summary>
+WITHMASTERKEY = 0x08
+}
+
+/// <summary>
+/// codes whether application master key authentication is needed before “Create File” / “Delete File”
+/// </summary>
+#[repr(u8)]
+pub enum CreateDeleteFile {
+/// <summary>
+/// “Create File”/ “Delete File”is permitted only with application master key authentication
+/// </summary>
+ONLYMASTERKEY = 0x00,
+
+/// <summary>
+/// “Create File”/ “Delete File”is permitted also without application master key authentication (default)
+/// </summary>
+NOKEY = 0x04,
+}
+
+/// <summary>
+/// Crypto method of the application
+/// </summary>
+#[repr(u8)]
+pub enum CryptoOperationsType {
+    TDES = 0x00,
+    TKTDES = 0x40,
+    AES = 0x80,
+}
+
+#[repr(u8)]
+pub enum FileAccessRights {
+    FREE = 0x0E,
+    NEVER = 0x0F
+}
+
+#[repr(u8)]
+pub enum FileCommunication {
+    /// <summary>
+    /// "Plain communication"
+    /// </summary>
+    PLAIN = 0x00,
+
+    /// <summary>
+    /// Plain communication secured by DES/3DES MACing
+    /// </summary>
+    MAC = 0x01,
+
+    /// <summary>
+    /// Fully DES/3DES enciphered communication
+    /// </summary>
+    ENCRYPT = 0x03
+}
+
+/// <summary>
+/// codes whether application master key authentication is needed for file directory access
+/// </summary>
+#[repr(u8)]
+pub enum FileDirectoryAccess {
+    /// <summary>
+    /// Successful application master key authentication is required for executing the “Get FID List”, “Get File Settings”and “Get Key Settings”commands
+    /// </summary>
+    ONLYMASTERKEY = 0x00,
+
+    /// <summary>
+    /// “Get FID List”, “Get File Settings” and “Get Key Settings” commands succeed independentlyof a preceding application master key authentication (default)
+    /// </summary>
+    NOKEY = 0x02,
+}
+
+/// <summary>
+/// Indicates use of 2 byte ISO/IEC 7816-4 File Identifies for files within the Application
+/// </summary>
+#[repr(u8)]
+pub enum FileIdentifies {
+    NOTUSED = 0x00,
+    USED = 0x20
+}
+
+#[repr(u8)]
+pub enum FileTypes {
+    /// <summary>
+    /// Standard Data File
+    /// </summary>
+    STANDARD =  0x00,
+
+    /// <summary>
+    /// Backup Data Files
+    /// </summary>
+    BACKUP = 0x01,
+
+    /// <summary>
+    /// Value Files with Backup
+    /// </summary>
+    VALUE = 0x02,
+
+    /// <summary>
+    /// Linear Record Files with Backup
+    /// </summary>
+    LINEARRECORD = 0x03,
+
+    /// <summary>
+    /// Cyclic Record Files with Backup
+    /// </summary>
+    CYCLICRECORD = 0x04
+}
+
+mod apduinstructions;
+mod apdustatuscodes;
+mod desfire;
\ No newline at end of file