ECB: [electronic codebook] mode- serially encrypts each 64-bit plaintext block using same 56-bit key. If two identical plaintext blocks are encrypted using the same key, their ciphertext blocks are the same.
CBC: [Cipher Block Chaining] mode- each 64-bit plaintext block is XORed bitwise with the previous ciphertext block and then is encrypted with the DES key. Because of this process, the encryption of each block depends on previous blocks. Encryption of the same 64-bit plaintext block can result in different ciphertext blocks. It daisy chains the blocks together. Cisco routers use this.
CBC: [Cipher Block Chaining] mode- each 64-bit plaintext block is XORed bitwise with the previous ciphertext block and then is encrypted with the DES key. Because of this process, the encryption of each block depends on previous blocks. Encryption of the same 64-bit plaintext block can result in different ciphertext blocks. It daisy chains the blocks together. Cisco routers use this.