only adj. 1.唯一的。 2.無(wú)比的,獨(dú)一無(wú)二的;最適當(dāng)?shù)摹? an only child 獨(dú)生子。 This is the onlyexample [These are the only examples] I know. 我知道的例子只有這一個(gè)[這些]。 one's only hope 某人的唯一希望。 the only man present 唯一的出席者[在場(chǎng)的人]。 He's the only man for the position. 他是最適宜那個(gè)職位的人。 adv. 1.僅僅;只,單,才;不過(guò)。 2.結(jié)果卻;不料。 I can only guess [guess only]. 我只能推測(cè)罷了。 O- I [I only] can guess. 只有我能夠猜得出。 O- fancy! 想想看罷!He came only yesterday. 他是昨天才來(lái)的。 He went to the seaside only to be drowned. 他去海邊游泳結(jié)果卻淹死了。 if only 只要…,只要…就好了 (If only he would stop talking! 只要他不講話就好了)。 not only ... but (also) 不但…而且…。 only by ... can ... 只有…才能…。 only just 好容易;剛剛才;恰好 (I have only just received it. 我才收到。I was only just in time.我剛好趕上)。 only not 簡(jiǎn)直是;跟…差不多。 only too 極,太,非常;實(shí)在;可惜(only too glad 極樂(lè)意 (to do)。 only too true 千真萬(wàn)確)。 1.但是,可是。 2.〔與 that 同用〕除了…;要不是…。 He makes good resolutions, only he never keeps them. 他決心雖好,但不能持久。 I should like to go, only that I am ill. 我倒很想去,可是我有病。 only for 要是沒(méi)有 (O- for my tea, I should have had the headache. 要是不喝茶,我又會(huì)犯頭痛病了)。
attack vt. 1.攻擊 (opp. defend)。 2.非難,抨擊。 3.著手,動(dòng)手,投入。 4.(疾病)侵襲。 5.【化學(xué)】腐蝕。 We will not attack unless we are attacked; if we are attacked, we will certainly counter- attack。 人不犯我,我不犯人;人若犯我,我必犯人。 attack a task 動(dòng)手工作。 attack a problem 著手解決問(wèn)題。 Strong acids attack metals. 強(qiáng)酸對(duì)金屬有腐蝕作用。 be attacked with (a disease) 害(病)。 n. 1.攻擊 (opp. defense), 襲擊。 2.抨擊。 3.【航空】迎角,沖角,攻角。 4.著手,動(dòng)手。 5.發(fā)作,發(fā)病。 6.(表演或競(jìng)賽中的)主動(dòng)。 A- is the best defense. 進(jìn)攻是最好的防御。 an attack formation 攻擊隊(duì)形。 have an attack of 為…所侵襲;害,患(病)。 make an attack on 攻擊。 n. -er 攻擊者。
The method in question is a ciphertext - only attack . this means that we don ' t need bits of guessed / known plaintext for a successful decryption 解決問(wèn)題的方法是對(duì)純密碼信息進(jìn)行攻擊。這意味著我們不需要猜解或在已知明碼文本的某些比特位信息的情況下來(lái)對(duì)密文進(jìn)行完美解密。
百科解釋
In cryptography, a ciphertext-only attack (COA) or known ciphertext attack is an attack model for cryptanalysis where the attacker is assumed to have access only to a set of ciphertexts.